| 摘要: |
| 本文基于雷诺平均N-S方程, 并结合RNGk-ε方程建立了粘性数值波浪水槽, 对不同波陡、不同相对水深、不同相对波高的非线性规则波的阻尼消波问题和波场分布进行研究。文中提出了两种描述消波区内部阻尼变化的阻尼函数, 分别适用于小波陡情形和高波陡情形。研究结果表明, 小波陡组消波区可设为一个波长, 阻尼系数取104～105即可满足消波要求, 计算结果与实验结果及造波理论吻合良好; 高波陡组消波区可设为两个波长, 阻尼系数取104～105亦可满足消波要求, 计算结果与实验结果吻合良好。此外, 当波陡较小时, 波场内反射情况的小幅改变即可对整个波场造成影响, 特别是当水深较浅时这种影响极为明显, 需谨慎考虑。当波陡较大时, 水波能量较高, 整个波场沿水波传播方向可观测到明显的衰减现象, 在具体试验中需进行考虑。 |
| 关键词: 阻尼消波 多孔介质 数值波浪水槽 推板造波法 非线性波造波 |
| DOI：10.11759/hykx20171128003 |
| 分类号: |
| 基金项目:“十三五”国家重大科技基础设施建设项目(超重力离心模拟与实验装置) |
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| Study of nonlinear wave absorption and the wave fields |
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WANG Qiao-sha,LI Ming-hai
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| Abstract: |
| In this paper, the Reynolds averaged N-S equations and RNG k-ε equations are solved for establishing the viscous numerical wave tanks. The problem of the damping absorption and the distribution of wave fields with different wave steepness, wave length to water depth and wave height to water depth is studied in the viscous numerical wave tanks. Two damping functions for describing the variation of the damping in damping zone are presented. They are suitable to the cases with small wave steepness and the cases with high wave steepness respectively. The resulting shows that for the cases with small wave steepness the length of damping zone can be set to one wave length, the damping coefficient can be set from 104 to 105, then the requirement of wave absorption can be meet and the numerical results agree well with the theoretical and experimental results; for the cases with high wave steepness the length of damping zone can be set to two wave lengths, the damping coefficient can be set from 104 to 105, then the requirement of wave absorption can be meet and the numerical results agree well with the experimental results. In addition, for the cases with small wave steepness the whole wave fields will be influenced even with a moderate changes in wave reflection, especially when the wave tanks with a relative small water depth, which should be given a more closely attention. And for the cases with high wave steepness the wave attenuation along the direction of wave propagation should be considered. |
| Key words: damping absorption porous media numerical wave tanks piston-type wavemaker nonlinear wave generation |
